I bought seed and bought these "greenhouse on a shelf " to plant them. They are in a barn under garage led lights. They have sprouted but are very thin. Should the lid be removed? Is my poor lighting causing this issue of long thin plants?
first time to grow broccoli is it supposed to flower?
No is my answer, that looks to have bolted. Flowering is the end of the cycle for bracicaes and they will do this early if they are stressed. They ideally like cool , bright and well watered conditions. https://extension.umd.edu/hgic/topics/flower-stalks-form-vegetables
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Do you have a greenhouse or cold frame?
Is this the right sowing time for your climate?
Will you have enough well lit space to grow these on after pricking our into modules / pots? It’s amazing how much space they need.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
https://extension.umd.edu/hgic/topics/flower-stalks-form-vegetables